Bi12SiO20熔体表面张力对流研究

无机材料学报, 2001, 16(1): 32-36. doi: 10.3321/j.issn:1000-324X.2001.01.005

Bi12SiO20熔体表面张力对流研究

梁歆桉 ^1, , 金蔚青 ^2, , 潘志雷 ^3, , 刘照华 ^4,

1.中国科学院上海硅酸盐研究所,

2.中国科学院上海硅酸盐研究所,

3.中国科学院上海硅酸盐研究所,

4.中国科学院上海硅酸盐研究所,

关键词： Bi12SiO20 熔体 , 表面张力对流 , 实时观察 , 对流转变

Study on Bi12SiO20 Melt Marangoni Convection

利用高温熔体实时观察装置观察和研究了Bi12SiO20熔体中表面张力对流从稳态向振荡态的转变过程;稳态过程中的对流图样变化;可能与对流转变有关的两个对流区域的交叉;振荡态对流的分叉现象.

Schilren technique coupling differential interferential microscope was employed to in-situ observation high temperature Bi12SiO20 melt Marangoni convection. The bifurcation of oscillatory convection was also observed in this experiment and the oscillatory frequency was obtained as 57Hz. In the steady convection stage, the flow configuration appears as fish-like shape which comprises of a main-trunk and two branches. The width of the main-trunk decreases with temperature rising. Meanwhile, along the main-trunk two darker color regions appear symmetrically. The distance between them becomes, narrower gradually and crossed together at last. This is the critical point for the transition to oscillatory convection. The critical Marangoni number Mac 22433 experimentally obtained for Bi12SiO20 melt, agrees with a theoretical speculation Mac=2884Pr0.638 for high Prandtl number melt.

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